Purple Water is a privately owned dam located in Loma, Montana, along the Alkali Springs Coulee.
Wind
Humidity
Built in 1916 by the USDA NRCS, this Earth dam serves multiple purposes including fire protection, stock watering, and as a small fish pond. With a height of 20 feet and a length of 210 feet, Purple Water has a storage capacity of 94 acre-feet, making it an essential water resource for the area.
Managed by the DNRC, Purple Water is regulated, inspected, and enforced by the state of Montana to ensure its safety and functionality. Despite its low hazard potential and unknown condition rating, the dam continues to play a crucial role in water management for the surrounding area. With a maximum discharge of 90 cubic feet per second and a spillway width of 20 feet, Purple Water is equipped to handle potential emergencies and contribute to the overall water sustainability in Liberty County.
As a key feature in the watershed, Purple Water serves as a reminder of the importance of proper water resource management and climate resilience. With its historical significance and ongoing maintenance, this dam continues to be a valuable asset for the community while highlighting the intersection of water infrastructure and environmental stewardship in the region.
Year Completed |
1916 |
Dam Length |
210 |
Dam Height |
20 |
River Or Stream |
ALKALI SPRINGS COULEE |
Primary Dam Type |
Earth |
Hydraulic Height |
20 |
Drainage Area |
3 |
Nid Storage |
94 |
Hazard Potential |
Low |
Nid Height |
20 |
Marias River Near Chester Mt
|
249cfs |
Teton River Near Dutton Mt
|
83cfs |
Marias River Near Loma Mt
|
335cfs |
Teton River At Loma Mt
|
30cfs |
Missouri River At Fort Benton Mt
|
4720cfs |
Lake Creek Near Power Mt
|
30cfs |
| Location | Reservations | Toilets |
|---|---|---|
Sanford Park - Lake Elwell - USBR
|
||
Island Area - Lake Elwell - USBR
|
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Sanford Park - Tiber Reservoir (Lake Elwell)
|